Hanna Instruments HI 99551 - Manual (Page 2)

OPERATIONAL GUIDE
INFRARED SENSOR MEASUREMENT
Switch the instrument on.
For HI 99556 models, check that the
instrument is in IR (infrared) mode.
If necessary (a “P” tag appears on the LCD to indicate
“external probe mode”), press the IR/CONTACT button to
switch to IR (infrared) measurement mode.
To measure the temperature
of an object, simply aim the
sensor in the direction of the
object.
READING DISTANCE
The distance between the sensor and the object is an
important factor in infrared measurement.
The relation between “distance/object area” is 3:1. This
means that the diameter of the measured area is one third of
the distance between the sensor and the object.
For example, if the sensor is 15 cm away from the object, the
instrument measures the temperature of an area with a 5 cm
diameter.
BATTERY REPLACEMENT
Battery replacement must only take place in a safe area and
using a 9V alkaline battery.
Simply slide off the battery cover on the back of the meter,
detach the battery from the terminals and attach a new 9V
battery, while paying attention to the correct polarity. Re-
place the battery cover.
ACCESSORIES
HI 710004 Soft carrying case
HI 710007 Blue shockproof rubber boot
HI 710008 Orange shockproof rubber boot
HI 721316 Rugged carrying case
HI 731318 Wiping tissue (4 pcs)
HI 740016 Battery cover
HI 740123 Wrist-strap
HI 765PW Penetration thermistor probe with white handle
CE DECLARATION OF CONFORMITY
IST99556R3 07/05
Recommendations for Users
Before using these products, make sure that they are entirely suitable for the environment
in which they are used.
Operation of these instruments in residential area could cause unacceptable interference to
radio and TV equipment, requiring the operator to take all necessary steps to correct
interferences.
Any variation introduced by the user to the supplied equipment may degrade the instruments'
EMC performance.
To avoid damage or burns, do not perform any measurement in microwave ovens.
EMISSIVITY
The instruments measure the temperature of objects with an
emissivity of 0.95, which is the characteristic of most sub-
stances, such as organic material, water, plastic, fabrics, etc.
To measure substances that have a polished surface and are
very reflective, the emissivity needs to be compensated. It is
advisable to cover the object with black paint or black
adhesive tape to compensate for the reflectivity.
WARNING
To avoid damage, do not hold the sensor too close to a heat
source for a long period.
SENSOR CLEANING
To maintain the instrument’s accuracy, it is important that
the sensor lens is kept clean. To clean the sensor, gently wipe
the lens with a humid and non-abrasive cloth (HI 731318).
EXTERNAL PROBE (HI 99556 only)
Connect the HI 765PW tem-
perature probe to the connector
on top of the instrument.
MEASUREMENT MODE
Press the IR/CONTACT button to select the external probe
measurement mode: “P” appears on the LCD to indicate that
the mode has been entered.
Dip the probe in the substance which to be measured (an
immersion level of approximately 4 cm is recommended), and
wait for the reading to stabilize.
LOW BATTERY
These instruments continuously check the battery status. If the
battery level is too low to ensure realiable reading, the meter
shuts off the LCD completely. In this case and if the meter can
not be switched on, it is recommended to replace the battery
immediately.
OFF ON
CONT ACT IR